ev->set_property ("numerator", mus->get_property ("numerator"));
ev->set_property ("denominator", mus->get_property ("denominator"));
ev->set_property ("tweaks", mus->get_property ("tweaks"));
ev->set_property ("numerator", mus->get_property ("numerator"));
ev->set_property ("denominator", mus->get_property ("denominator"));
ev->set_property ("tweaks", mus->get_property ("tweaks"));